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По результатам анализа материалов публикаций (Твалавадзе, 1950; Митрофанова, 1951; Алиходжаев, 1954; Есипенко, 1962; Поддубный и др., 1967; Симонян, 1968; Чхаидзе, 1970; Шаламберидзе, 1973; Линник, 1973; Лазарев, 1979) нанесен ареал и зоны вредоносности P. pyri.
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Scientists were given maps with boundaries of Oblasts and arable lands. After reviewing historic literature, species distribution was hand drawn on maps. If data were on the Oblast-level, distribution is on the Oblast level. In some cases, Oblast.s are further refined by boundaries of the Arable Land Map (Koroljeva et al., 2003). Hand drawn maps were scanned, georeferenced and vectorized. The area and damage zones of P. pyri have were determined according to the following sources: Tvalavadze (1950), Mitrofanova (1951), Alikhodzhaev (1954), Esipenko (1962), Poddubnyi et al. (1967), Simonyan (1968), Chkhaidze (1970), Shalamberidze (1973), Linnik (1973), Lazarev (1979). The materials of VIZR expeditions were also used. The borders of the different zones of harmfulness were determined according to criteria published by the following sources: Alikhodzhaev (1954), Shchegolev (1960); Vasil'ev et al. (1973), Osmolovskii & Bondarenko (1973), Migulin (1983). The northern border was determined according to the following published materials: Shaposhnikov (1964), Vasil'ev et al. (1973), the data of VIZR expeditions, and data from a suction trap. The results of the analysis of host (pear- trees) spreading was used according to the atlas of the USSR vegetation, taking into account the temperature preference of this insect. The vector map of distribution of fruit-trees within the territory of the Former Soviet Union (Tochenov, 1984) and the northern border of wild pear vegetation (Danilevskii & Kuznetsov, 1968) were used for the correction of the borders of damage zones.
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